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Line 8: ==Control system use== [[File:Set-point control.png\|thumb\|Block diagram of a [[Negative feedback\|negative feedback control system]] used to maintain PV = SP]] Measurement of process variables ~~are~~is essential in [[control system]]s to controlling a process. The value of the process variable is continuously monitored so that control may be exerted. Four commonly measured variables ~~which~~that affect chemical and physical processes are: [[pressure]], [[Thermodynamic temperature\|temperature]], level and flow.{{citation needed\|date=December 2011}} but there are in fact a large number of measurement quantities which for international purposes use the [[International System of Units]] (SI) The SP-PV error is used to exert control on a process so that the value of PV equals the value of the SP. A classic use of this is in the

Process variable: Difference between revisions